ox

noun3

1. •
   An adult castrated male of cattle (B. taurus), especially when used as a beast of burden.
2. •
   Any bovine animal (genus Bos).

   • Here the same four kinds are mentioned ... These are sheep, goats, camels and oxen. — 1934
3. •
   Abbreviation of oxygen.

   • I'm super excited to be on the summit of K2! No Ox! (coughs) It was hard. — 2020